26 Jun Autopolyploidy Allopolyploidy & Hardy-Weinberg Equilibrium Exercises
Question
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Autopolyploidy Allopolyploidy & Hardy-Weinberg Equilibrium Exercises
1.
A. A new plant species B forms by autopolyploidy from species A, which has a
chromosome number of 2n = 10. Assuming that the cell’s chromosome number was
doubled from the diploid number (2n) to a tetraploid number (4n), how many
chromosomes would species B have? ____________
B. To explain the process that generated the tetraploid cell of problem #1
implement the following guidelines
draw a series of diagrams that represent a cell going through the process of
cell division
label each one of these cells with the number of chromosomes it contains
indicate where a meiotic error took place.
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2.
If species A in problem # 1 were to hybridize by allopolyploidy with species C (2n =
14) and produce a new, fertile species, D, how many chromosomes would species D
have? Use the following guidelines to answer the question:
Draw a series of diagrams to describe the process of allopoliploidy. Each
diagram should depict a cell going through the meiotic process
label each cell with the number of chromosomes it contains
indicate where a meiotic error(s) took place.
3. In a Hardy-Weinberg population with two alleles, B and b, that are in equilibrium, the
frequency of the allele b is 0.4. What is the percentage of the population that is
homozygous for this allele? Explain your answer. ______
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4. In a Hardy-Weinberg population with two alleles, B and b, that are in equilibrium, the
frequency of allele b is 0.1. What is the percentage of the population that is heterozygous
for this allele? Explain your answer. ______
5. Assuming that cystic fibrosis is a disorder in Hardy-Weinberg Equilibrium and that the
frequency of individuals born with cystic fibrosis in a ficticious country is approximately
2/1000, calculate the frequency of carriers for the disorder. Note that cystic fibrosis is a
disorder that results from homozygosity at a recessive allele.
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